A portal to the Badlands can be found alongside Lead Titan Researcher Sorotis next to the Obsidian Enclave on the western side of Valdrakken.
Although the three seasonal portals by the bank are hard to miss, Uldaman: Legacy of Tyr is actually a brand new dungeon in Dragonflight rather than a seasonally returning one, despite being a branch of the existing Uldaman from vanilla WoW. This is why it’s portal is located in a different spot, where players can also turn in Titan Relic for extra reputation. Don’t be fooled into taking the seasonal portal to Uldum though – despite the similar sounding name, it will actually take you to the Vortex Pinnacle instead!
Don’t forget to turn in Titan Relic while your there!